I'm building a Lawful Neutral cleric of Abadar, and picture her channeling negative energy as "Abadar's rebuke of the unjust". In my case, she'll use the Rulership variant channeling rules, cutting the damage in half but dazing any who fail a save for one round, which has the further flavor of dazing them as they feel the Judge of the Gods' disapproving gaze.
The flavor of how I'm thinking of it -- and the source of the effect -- are Lawful Neutral, not Evil...but I wanted to double check, at least rules-as-written, are all negative energy effects evil?
(Negative energy sure sounds, well, "negative"...but can it just be a tool like a sword that needs to be exercised wisely? Or is it evil in some intrinsic way, in the game world (which I suppose is at least implied by the fact that Good clerics and Good gods don't do it?))